JPS6043619A - Zoom lens barrel - Google Patents

Abstract

PURPOSE:To improve the precision of constitution wherein a part of lens group which moves in zooming moves even in focus adjustment by fitting a cam ring which has a degree of freedom in two directions, i.e. rotating direction and optical-axis direction around a fixed lens barrel, and transmitting the operation of a zooming ring and a focusing ring to the cam ring without mutual disturbance. CONSTITUTION:When the zooming ring 4 is rotated in zooming, the zooming ring 4 rotates without moving in the optical-axis direction and this rotation rotates the 1st moving frame 9 and a pin 15, so that the 1st moving frame 9 is extended forward while rotating. The cam ring 2, on the other hand, also rotates according to the rotation of the pin 15, and consequently cam grooves 1b and 2b of the fixed lens barrel 1 move relatively to move the 2nd moving frame 10. Further, the rotation of the cam ring 2 moves the cam grooves 2c and 2d, and the groove 1c of the fixed lens barrel 1 relatively to move the 3rd - the 5th moving frames 11-13. Thus, the zooming is attained and focusing rings 6 and 8 are still, in this case, together with the fixed lens barrel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a lens moving mechanism in a zoom lens barrel;
In particular, the present invention relates to a mechanism for independently moving a part of a lens group that is moved for zooming by a focusing operation.

Conventional Wave Technique Conventionally, in zoom lenses, a configuration has been generally used in which the frontmost lens group is extended during focus adjustment (ζ).

However, if this fS configuration is used for a high-magnification zoom lens that includes a wide-angle range, the amount of light will decrease or increase at the periphery of the screen. Problems such as a large fS increase occur. In order to solve this problem, for example, Japanese Patent Laid-Open No. 57-37308 proposes a system in which a lens group that is moved for zooming is also moved during focus adjustment. In this proposal, each lens group is configured to be driven by a cam groove, etc. provided on a member that moves during zooming, and some lens groups are driven by a cam groove, etc. provided on a member that moves during focus adjustment. It is configured to be However, this configuration requires separate members f and f that move during zooming and focus adjustment, making the structure complicated, and the lens groups that move both during zooming and focus adjustment require separate operations. A complicated holding mechanism is sometimes required to allow different fλ movements. In addition, in a high-power zoom lens including a wide-angle range (it is a component), each lens can be installed with high precision, but if the configuration is as complicated as the conventional technology, the tilt of the lens group The greater the eccentricity, the more difficult it is to achieve high accuracy.

Also, if the lens group that moves during focus adjustment is located near the front of the zoom lens barrel, the focus adjustment operation member must be placed near the front of the zoom lens barrel, or in that case, as proposed in recent years, If you try to adjust the focus of the lens using the autofocus mechanism on the camera body side, the focus adjustment member will be far from the camera body, and the installation space for the part H that connects the two will be large. However, there may be some inconveniences such as low k transmission accuracy or low tl.Therefore, the focus adjustment operation member should be placed near the rear of the lens barrel (
If the lens group that moves during focus adjustment is located closer to the front of the camera body, it is difficult to transmit the i1% power from the operating unit assembly to the lens group.

Purpose The present invention provides a zoom lens barrel in which a part of the lens group that moves during zooming also moves during focus adjustment, which can achieve high precision with a simple fj configuration, and which is driven by a drive shaft from the main body. The objective is to obtain a configuration that allows easy focus adjustment.

Examples Examples of the present invention will be described below. A first embodiment of the invention is shown in FIGS. 1-3. FIG. 1 shows a longitudinal section of the interchangeable lens fLl, and furthermore, the upper half of the optical axis as a boundary shows the short focus side and the infinity focus state, and the lower half shows the short focus side and the shortest distance focus state.

In the figure (Hfrll Tsukuda + 11Vl ffl is husband/
Each lens group is composed of one lens or a combination of a plurality of lenses, and from the front of the interchangeable lens, they are referred to as the first lens group to the fifth lens group fil. Luns group (
Zooming is performed by moving the eye to the fifth lens group tv+, and focus adjustment is performed by moving the third lens group full+ to the fifth lens group tv+. Each lens group old to +V+ are the first to fifth moving frames (9) 10) +Ill [12+ 13
It is held at +.

The interchangeable lens +LI has a mount part (3) for being attached to the camera body, and is provided with a fixed lens barrel (1) integrally with the mount part (3). The fixed lens barrel (1) is immovable relative to the camera body to which it is attached. Fixed barrel (1)
First, the first cam groove (1a) and the second cam groove (l l
)) are formed, and a first linear groove (IC) and a second linear groove (1d) are further formed in a direction along the optical axis of the lens groups ill to tVl (hereinafter simply referred to as the optical axis direction). There is. In addition, there is a pin (21'l (22
1 has been planted.

A first movable frame (9) is fitted on the outside of the fixed lens barrel (1), and a first movable frame (9) is fitted in front of the interchangeable lens (Lll).
) is formed with a higashikawa notch (9a), and the fixed lens barrel (
1) -1x pin (22) is 2'1. The first movable frame (9) has a pin (15) implanted inside it and the first cam groove (1a) of the fixed lens barrel (1) mentioned above.
) is passed through.

Another pin (20) is installed outside the first moving frame (9).

A zoom ring (4) is fitted further outside the first moving frame (9). The zoom ring (4) is formed with a long hole (41>) extending in the circumferential direction, and is implanted in the fixed lens barrel (1) to provide a relief notch (9a) for the first movable frame (9). The pin (22) passing through is fitted into this. Further, the zoom ring (4) is formed with a straight groove (4a) extending in the optical axis direction, and the zoom ring (4) has a straight groove (4a) extending in the optical axis direction.
It is embedded in 11.

On the other hand, on the outside of the fixed lens barrel (1) and toward the rear of the interchangeable lens iLI, a distance insert (6) and a distance ring B (8) are fitted.

The distance implant (6) has an acid screw on the inner periphery, and the fixed lens barrel (1)
It is connected with a male thread formed on the outer periphery. The distance embedding (6) has a gap with the fixed lens barrel (1) other than the screw connection portion, and the pin (21) on the fixed lens barrel (1) is installed in the gap. Distance ring A (6) has a pin (21) inside that can rotate and rotates at a certain angle.
The rotation is stopped when the protrusion (bb) comes into semi-contact with the protrusion (bb).

The distance insert (6) further has a cam groove (6a).

On the other hand, distance ring B (8) has distance embedding (6) and fixed lens barrel (1
), and the pin (18
) (19) are planted. Pins that extend outward (19
) fits into the cam groove (6a) of distance embedding (6), and
The extending pin (18) passes through the second rectilinear groove (]d) formed in the fixed lens barrel (1).

A cam ring (2) is fitted inside the fixed lens barrel (1) so as to be movable in the optical axis direction and circumferential direction. The cam ring (
2) has a first straight groove (2a) and a second straight groove (2b).
), a first cam groove (2C), a second cam groove (2d), and a circumference tR (2e). 1st straight tf
The pin (1) is installed in the first movable frame (9) and passes through the first cam groove (1a) of the fixed lens barrel (1).
5) or intrusion. The second straight groove (2b) has a pin (14) extending from the second movable frame (10) that holds the second lens group (11), and the pin (14) is connected to the fixed lens barrel (11).
) is inserted into the second cam groove (1b). Cam ring (
The pin (16) extending from the third moving frame (11) holding @33 Nonzu 011+ passes through the first cam groove (2C) of 2), and the second cam groove (2d) passes through the fourth lens group 11Vl.
A pin (17) extending from the fourth moving frame (12) that holds the
, each pin +16) +171 is further fixed lens barrel (
It fits into the first straight groove (IC) formed in 1). Note that the fifth moving frame (13
) is held integrally with the third moving frame (11). (
5) is an index ring with a focal length index marked outward, which allows you to know the focal length in conjunction with the scale provided on the zoom operation ring (4), and is provided on the outer surface of the distance operation insert (6). The shooting distance can be determined by looking at the distance scale through the window of the indicator ring (5).

Figure 2 shows the operational relationship of each lens flint to m when zooming is performed with the interchangeable lens fLl having the above configuration, and Figure 3 shows the relationship between the movements of the lenses flint to m when zooming is performed with the interchangeable lens [Ll]. In order to explain the operation of each lens group corresponding to each operation of the fixed lens barrel (1
) and the cam ring (2) are shown expanded. In FIG. 3, one of the interchangeable lenses (Ll is in front, that is, the left side in FIG. 1.) Zooming in this embodiment will be explained with reference to FIGS.
is assumed to be in a short focus state.

To perform zooming, first rotate the zoom operation ring (4). The zoom ring (4) has a pin (22) and a circumferential elongated hole (4).
13), it only rotates without moving in the optical axis direction fS. This rotation causes the straight groove (4a) and the pin (2
The first moving frame (9) rotates together via the pin (1).
5) Try to rotate together. That is, the pin (15) moves to the right from the position shown in Fig. 3, and this movement is restricted by the first cam groove (la) of the fixed lens barrel (1), so that the pin (15) can be replaced. The lens (I) moves forward. That is, the first moving frame (9) is rotated and extended in one direction.

On the other hand, as the pin (15) rotates, the first straight groove (2)
a), the cam ring (2) also rotates. This rotation of the cam ring (2) causes the second straight groove (
2b) and the second cam groove (1
b) The pin (14) is driven and the second moving frame (10) is moved. Also, due to the rotation of the cam ring (2), the first rotation of the cam ring (2). Second cam groove (2C) (2d
) and the first linear groove (IC) of the fixed lens barrel (1) move relative to each other, the pin f16+ +171 is driven and the third to fifth moving frames tl+1 +12+ (13) move.

Through the above operations, zooming is performed from the short focus side to the long focus side. 3rd + 5th lens group (I
l ff1ll fil or reduction, 2nd. 4th lens group (
River 11Vl will retreat once and then move forward. In addition, when the fixed lens barrel (1) and the cup/ring (2) rotate relative to each other, the pin (18
) and the circumferential groove (2e) is free in the rotational direction, so the distance is A.

B (61+8+ is stopped together with fixed lens barrel (1).

Next, focus adjustment will be explained. First, distance ring A(6) is rotated. Since the distance embedding (6) is screwed to the fixed lens barrel (1), it moves in the optical axis direction by the lead of the screw when rotated. Due to the rotational movement of the distance ring A (6) including movement in the optical axis direction, the second pin (19) of the distance ring Bt8 is driven by the cam groove (6a), and the pin (18) is driven by the fixed 41
It is guided by the straight groove (1d) of f52 of 11ii1 (1) and goes straight.

Since the pin (18) engages with the circumferential groove (2e) of the cam ring (2), it drives the cam ring (2) and moves it straight in the optical axis direction.

When the cam ring (2) goes straight, the first and second cam grooves (2C
) (2d) and the first linear groove (IC) of the fixed lens barrel (1) move relative to each other, and the pins t16+ +17+ are driven to move the 3rd degree, 4th. The fifth moving frame (11) (12)+13) moves in the optical axis direction to perform focus adjustment. Cam ring (2
) When moving straight, the first and second straight grooves (2a
) (21)) Since the pin t15) (141 is not driven, the first and second moving frames (9) (X01
is immovable.

As described above, in this embodiment, a cam ring (2) that can move in both the rotational direction and the optical axis direction is provided with respect to the fixed lens barrel (1), and the fixed lens barrel (1) and the cam ring (2) are movable in both the rotational direction and the optical axis direction. ) are formed with a straight groove and a cam, so by selectively moving the cam ring (2) in the rotational direction or the optical axis direction,
Depending on the direction of movement, the moving frame that holds the lens can be made to perform different operations.

Next, a second embodiment of the present invention is shown in FIG. FIG. 4 shows a vertical section of the interchangeable lens fLl cut in half. In the figure, old frl l is a lens group composed of one lens or a combination of a plurality of lenses, and is referred to as the first lens group and the second lens group from the front. The first and second lens groups (opening) move independently to perform zooming.
Focus adjustment is performed by moving only the 1121st group [11].

, the 7-year-old group is held in the first moving frame (A) and the second moving frame (A).

(30) is a fixed lens barrel that is integrated with the mounting section installed in the camera body, and is immovable with respect to the camera body.
Fru. The fixed lens barrel (30) has a first lens barrel extending in the optical axis direction ζ. 2nd degree straight ahead 7! '(30a) (30C),
It has a historical groove (301). Nao (30d)
is an escape hole.

A zoom ring (32) is fitted on the outside of the fixed lens barrel and toward the front of the interchangeable lens iLl.
2) has a straight groove (32a) formed therein. Further, a distance ring (33) is fitted on the outside of the fixed lens barrel (30) toward the rear of the interchangeable lens (+,), and a pin (39) is implanted inside the distance ring (33). , the pin (39) passes through the second straight groove (30C) of the fixed lens barrel.

A cam ring (31) is fitted inside the fixed lens barrel (30) so as to be movable in the optical axis direction and circumferential direction. The cam ring (31) has a cam groove (31a) and a straight groove (311).
), a circumferential groove (31d) is formed, and a circumferential groove (31d) is formed.
1, d) has a fixed lens barrel (33) installed in the distance ring (33).
The pin (39) that passed through the second straight groove (30C) of
) is inset. In addition, a pin (A) is installed on the outside of the cam ring (31), and the pin (A) passes through the relief hole (30d) of the fixed lens barrel (30) and connects the tip of the lens (Zoo 1) to the ring (32).
) is fitted into the straight groove (32a). Cam groove (3),
a), the lun group f1. The pin (3L) extending from the first moving frame (34) that holds the
) is fitted into the first straight groove (30a) of the fixed lens barrel.
) A pin (38) extending from the second moving frame (35) holding the second lens group frll passes through the pin (38), and the pin (38)
8) is fitted into the cam groove (30b) of the fixed lens barrel (audience).

To perform zooming f, f in the above configuration,
Rotate the zoom ring (32). This rotation causes the cam ring (31) to rotate together with the straight groove (32a) and the pin (36). The rotation of the cam ring (31) causes the cam groove (3
1a) and the first linear groove (30a) of the fixed lens barrel (30+) move relative to each other, and the pin (37) is driven to move the first moving frame (
34) Or move. Similarly, by rotating the cam ring (31), the straight groove (311)) and the fixed lens barrel (sword cam groove (30)
b) moves relative to each other, the pin (38) is driven, and the second moving frame (35) moves. By the above operation, the first and second
Zooming is performed by moving each lens group fllfm,
f be beaten.

To adjust the focus, move the distance ring (33) in the optical axis direction.This movement causes the pin (39) or the fixed lens barrel (
Move along the second straight groove (30C) of the
The cam ring (31) moves in the optical axis direction by being driven by the circumferential groove (31, d) into which the cam ring (39) is fitted. By this movement of the cam ring (31), the cam groove (31a)
The pin (37) is driven by moving relative to the first straight groove (30a) of the fixed lens barrel (3t) and the first moving frame (3t).
34) moves to adjust focus. When the cam R (31) moves straight, the straight groove (3) of the cam ring
Since the pin (38) fitted in 1b) is not driven, the second moving frame 1b) is immobile. Note that during zooming, if the cam groove (31a) of the cam ring (31) and the first nozzle U a iR (30a) of the fixed lens barrel (30) move relative to each other, the cam ring (31) and the distance ring (33) move relative to each other. ) may move in the optical axis direction, but the distance ring (33) and fixed lens barrel (30
) to prevent this movement.

As described below, in this embodiment, as in the first embodiment, by selectively moving the cam ring in the rotational direction or in the optical axis direction, the movable frame that holds the lens can perform different operations. I can do it.

Next, as shown in FIG. 5, a third embodiment in which an automatic focus adjustment (J2J, lower AF) device is applied to the second embodiment described above will be described. The configuration is similar to the second embodiment, but differs in the following points.
A male thread (33a) is provided on the outer periphery of the ring, and is not connected to a female thread (40a) formed on the inner periphery of a manual operation ring (4o) fitted on the outside of the male thread (33a).

-1- The distance manual operation ring (40) has a flange (40C) extending radially inward and toward the fixed lens barrel! 30) The distance manual operation ring (40) is prevented from moving in the optical axis direction by fitting into the circumferential groove (42) formed on the outer periphery.

Further, the distance manual operation ring (40) has a gear portion (4) on the inner periphery.
01)). On the other hand, the fixed lens barrel (30) has
A gear (41) is installed. The gear (41) meshes with the gear part (40b) of the manual distance operation ring (40), reaches the mount surface that contacts the camera body when the rotating shaft or interchangeable lens is attached to the camera body, and connects the driven part (4
1a) is fl L.

To explain the focus adjustment in this example, first
F ([If the camera body does not have a mechanism, by manually rotating the distance manual operation ring (40), the distance ring (33), which is screwed to the operation ring (40), will adjust the optical axis by the screw lead. The pin (39) and the cam ring (31) are guided by the second straight groove (30C) of the fixed lens barrel (30).
) is moved in the optical axis direction, and focus adjustment is performed in the same manner as in the second embodiment.

When the AF mechanism is included in the camera body, when the interchangeable lens (I-1) is attached to the camera body, the drive shaft (not shown) on the camera body side is connected to the driven part (41a) of the gear (41). When the drive shaft is rotated by the motor on the camera body side, the gear (41) rotates, and the distance manual operation ring (40) rotates to perform focus adjustment in the same way as in manual operation. Although the AF mechanism has been described, the present invention can be applied in exactly the same way to the case of so-called power focus, in which the camera user arbitrarily opens and closes the motor drive circuit on the camera body side to perform focus adjustment by driving the motor.

As described above, in the present invention, since the distance manual operation ring is installed at the rear of the interchangeable lens (closer to the camera body), an AF mechanism or a powered focusing mechanism can be easily installed.

Zooming in this embodiment is completely similar to that in the second embodiment, so a description thereof will be omitted. In this embodiment, the circumferential groove (42) of the fixed lens barrel (30) and the distance manual operation ring (40)
The flange part (40C) and the acid screw (40a) and the male and female parts (3
3a), the distance ring (33) is prevented from moving in the optical axis direction.
It is necessary to provide friction between the fixed lens barrel (30) and the fixed lens barrel (30).
stomach.

A fourth embodiment of the present invention is shown in FIG. In this embodiment, the positional relationship between the fixed lens barrel (1) and the cam ring (2) of the first embodiment (see Figs. 1 to 3) is reversed, and r, H
A cam ring (2) is fitted on the outside of the fixed lens barrel (1). Further, a first moving frame (9) that holds the first lens group fll is fitted inside the fixed lens barrel (1). Therefore, the first moving frame (9), the fixed lens barrel (1), and the cam ring (2)
The connection relationship is exactly the same as in the first embodiment except that the inside and outside are reversed. Note that, unlike the first embodiment, the first moving frame (9) and the zoom operation ring (4) are not directly connected to each other. On the other hand, a pin (45) is implanted on the outside of the cam ring (2) and is fitted into the straight groove (4a) of the zoom ring (4). Note that (IC) is an escape hole, and a part of the fixed lens barrel (1) that extends to hold the zoom ring (4) is inserted into the pin (45).
) is provided in such a way that it will not interfere with the operation of fs.

Also, in the first embodiment, the cam ring (2) was provided with a circumferential groove, and the pin implanted in the distance ring B (8) was fitted into this, or in this embodiment, this relationship was reversed. , a pin (46) is implanted in the cam ring (2), and the pin (46) is fitted into a circumferential groove (813) provided in the distance ring B (8).

Note that (1[) is an escape hole similar to (1e).

The distance ring B (8) has a straight groove (8a), and the fixed lens barrel (1
) extending from the pin (the pin is inserted. Also, the distance ring B
(8) has a screw thread on the inner periphery, and is threadedly connected to a male thread formed on the outer periphery of distance ring A (6). Furthermore, the distance ring A
The fact that (6) is screwed to the fixed lens barrel (1) is $
This is the same as the first embodiment.

A fixed lens barrel (1), a cam ring (2) and a second. Third. The connection relationship of the fourth moving frame flO)till (12) is the same as in the first embodiment.

In this embodiment, when zooming is performed, first the zoom ring (4) is rotated, the pin (45) is rotated together, and the cam ring (2) is rotated. Pin (14) +15+ due to relative rotation of fixed lens barrel (1) and cam ring (2)
+16+ +17+ are driven and the first to fifth moving frames 1
111GrlHIVlfVl Furnace transfer T le.

To perform focus adjustment, when the distance embedding (6) is rotated, the distance ring A (6) is rotated while being moved in the optical axis direction by a screw lead connected to the fixed lens barrel (1).

This rotation accompanied by movement in the optical axis direction/＼ is the cutting ring B (8)
However, since the distance ring B (8) rotates easily due to the engagement of the straight groove (8a) and the pin (47), the distance ring A [6+, l! :Moves only in the direction of the optical axis by the leads of the connecting screws. This movement drives the pin (46) in the optical axis direction, and the cam ring (2) moves in the optical axis direction. When the cam ring (2) moves in the optical axis direction, the cam ring (
Pin +16 fitted into cam (2C) (2d) of 2)
+ +17) is driven and the third. '$4. 4th. Moving frame +
11) (121 (13) moves, while the cam ring (2)
Pins fitted into the straight grooves (2a) (2b) of L+5
1 (141 remains in the stopped position, and moves from the 1st to the 2nd moving frame [9
) (10) is also stopped, which is exactly the same as in the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and it goes without saying that the configuration of the optical system can be variously configured as necessary.

Further, in the third embodiment, a first focus adjustment mechanism is provided which is driven by a drive shaft on the camera body side.
A similar mechanism can be provided in the embodiment and the fourth embodiment.

Effects As described above, in the present invention, in the zoom lens barrel, a cam ring having degrees of freedom in two directions, the rotational direction and the fj direction parallel to the optical axis, is fitted to the fixed barrel, and zooming is performed. A zoom ring for adjusting the focus and a distance ring for adjusting the focus are provided.
Providing means for transmitting the movements of both rings to the cam ring so as not to interfere with each other, so that the cam ring can move in two directions,
When the cam ring rotates due to zooming, especially when the cam ring moves parallel to the optical axis due to the zooming mechanism that moves the lens group for zooming and the focus adjustment operation, the lens group that should be moved only during zooming is prevented from moving, and the focus adjustment is performed. A focus adjustment mechanism is provided to move only the lens group for use in the camera.

Therefore, zooming and focusing can be done with a single cam ring.
, f, simple... It is possible to have a simple configuration, and therefore, it is possible to improve the installation accuracy.

Furthermore, since the lens group that is moved only during zooming is not affected at all during focus adjustment, the manual distance control ring should be installed near the camera body regardless of the location where the lens group used for focus adjustment is installed. This makes it possible to reduce the installation space of the transmission means and improve transmission accuracy when power-driven focus adjustment is performed using the drive shaft on the camera body side.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the first embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operation of the same embodiment during zooming, FIG. 3 is an exploded view of the main parts of the above embodiment, and FIG. Second aspect of the present invention
FIG. 5 is a cross-sectional view of a main part showing a third embodiment of the present invention, and FIG. 6 is a half-sectional view of a fourth embodiment of the present invention. 1, 30-1? i'l fixed lens barrel, 2.31... cam ring,
4, 32 zoom ring (zoom manual operation ring), 2a,
4a+9, 15.20.323.36.45 ・Zoom rotation transmission means, 8.33 Distance ring, 1 (1, 2e,
18.46 Focus adjustment movement transmission means, Iall+),
1(+23121)l 2C+ 2d114, 15
．． 16. +7.30a, 30b, 31a, 31
b, 37.38・zooming/focus adjustment/movement means;
41o, driven shaft, 40, distance manual operation ring, 40b,
41 Drive transmission means. Applicant Minolta Camera Co., Ltd.

Claims (1)

[Claims] 1. In a zoom lens that constitutes a zoom optical system and moves some of the lens groups among the plurality of lens groups that move during zooming during focus adjustment, there is a fixed lens barrel that is immovable, and a rotation direction and optical direction relative to the fixed lens barrel. A cam ring fitted so as to be able to move in the direction f1 parallel to the axis; a zoom ring fitted on the outside of a fixed lens barrel so that movement in the direction of the optical axis is restrained and rotation is performed by a zoom operation; and the zoom ring A zoom rotation transmission means that transmits the rotation of the cam ring parallel to the optical axis of the cam ring without restricting its movement in -C rotation, and a zoom rotation transmission means that rotates the cam ring in a direction parallel to the optical axis of the cam ring without restricting the movement of the cam ring. a distance ring fitted on the outside of the fixed lens barrel so as to move in the fl direction parallel to the optical axis; A focusing movement transmission means for moving, a zooming mechanism for moving a zooming lens group by rotating the cam ring, and a zooming mechanism for moving the focusing lens group by moving the cam ring in a direction parallel to the optical axis. 1. A zoom lens barrel comprising: a zooming focus adjustment/movement means comprising a focus adjustment mechanism that keeps other lens groups stationary; 2. The zooming focus adjustment/moving means is formed in a guide pin provided on the holding frame of the lens group that moves only during zooming, and a cam groove and a cam ring formed in the fixed lens barrel so that the guide pin fits therein. a zooming mechanism having an optical axis direction groove, another guide pin provided on the holding frame of the lens group that moves during focus adjustment, and an optical axis formed on the fixed lens barrel so as to fit with the other guide pin. 2. A zoom lens body according to claim 1, comprising a focus adjustment mechanism having a direction groove and a cam groove formed in a cam ring. 3. The focus adjustment movement transmission means consists of a pin provided on the distance ring, an optical axis direction groove formed in the fixed lens barrel so that the pin fits, and a circumferential direction groove formed in the cam ring. A zoom lens barrel according to claim 1 or 2, characterized in that: 4. The cam ring fits inside the fixed lens barrel, and the zoom rotation transmitter stage is provided with a $1 moving frame that fits between the zoom ring and the fixed lens barrel, and the first moving frame. First and second pins, an optical axis direction groove formed in the zoom ring so that the first pin fits therein, and a cam groove and a cam ring formed in the fixed lens barrel so that the second pin fits therein. A zoom lens barrel according to claim 3, characterized in that fS is separated from an optical axis direction groove formed in the optical axis direction groove. 5. The cam ring fits inside the fixed lens barrel, and the zoom rotation transmission means consists of a pin provided on the cam ring and an optical axis direction groove formed on the zoom ring so that the pin fits. A zoom lens barrel according to claim 3. 6. In a zoom lens attached to a camera body equipped with a focus adjustment drive motor and a drive shaft that is an output end of the drive force transmitted from the motor, the zoom lens engages with the drive shaft to transmit the drive force. a driven shaft that moves, a fixed lens barrel that does not move,
A cam ring that fits into the fixed lens barrel so that it can move in the rotational direction and in a direction parallel to the optical axis, and a lens exchange mount on the outside of the fixed lens barrel that rotates while being restricted from moving in the optical axis direction during zoom operations. For a zoom manual operation ring that fits in a position far from the cam ring, the rotation of the zoom manual operation ring is transmitted to the cam ring and rotated without restricting the movement of the cam ring in a direction parallel to the optical axis of the cam ring. a transmission means, a distance manual operation ring that is fitted in a position close to the lens exchange mount on the outside of the fixed lens barrel and is rotated while being restricted from moving in the optical axis direction; and a distance manual operation ring that is rotated by operating the distance manual operation ring. A distance ring is fitted to the outside of the fixed lens barrel so as to be constrained and move in a direction parallel to the optical axis, and the movement of the distance ring is transmitted to the cam ring without restricting the rotation of the cam ring to produce light. A focus adjustment movement transmission means for moving in a direction parallel to the axis, a zooming mechanism for moving a zooming lens group by rotating the cam ring, and a focus adjustment movement by moving the cam ring in a direction parallel to the optical axis. a zooming/focus adjustment/movement means consisting of a focus adjustment mechanism for moving one lens group and keeping other lens groups stationary, and the distance manual operation ring and the driven shaft described in - are connected by a drive transmission means. A zoom lens barrel characterized by: 7. The zoom lens barrel according to claim 6, wherein the drive transmission means is a pinion gear integrated with the driven shaft and an internal gear provided integrally with the manual distance operation ring and meshing with the pinion gear. .